Smectic polymorphism in a series of three-ring enaminoketone compounds
作者:
Ewa Górecka,
Wiesław Pyżuk,
Adam Krówczyński,
Jan Przedmojski,
期刊:
Liquid Crystals
(Taylor Available online 1993)
卷期:
Volume 14,
issue 6
页码: 1837-1846
ISSN:0267-8292
年代: 1993
DOI:10.1080/02678299308027719
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Liquid crystalline properties of 1 - (4′ - alkoxyphenylamino) - 3 - (4′ - hexyloxyphenyl)-prop-1-en-3-ones, from methoxy to heptadecyloxy, have been examined by optical, DSC, and X-ray methods. The phase diagram for the series exhibits a rich polymorphism of tilted smectic phases, for example, five mesophases were found for the hexyloxy derivative. A characteristic feature of the phase diagram is a gap in the crystal G phase area. For the heptyloxy homologue, a direct crystal H-smectic F phase transition was found; in the case of shorter as well as longer terminal substituents, the phase sequence crystal H–crystal G–smectic F is observed. Calorimetric and X-ray studies revealed the existence of a tricritical point on the crystal G–smectic F transition line.
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